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<h2><span class="refentrytitle"><a name="PangoEngineLang.top_of_page"></a>PangoEngineLang</span></h2>
<p>PangoEngineLang — Rendering-system independent script engines</p>
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<div class="refsect1" lang="en">
<a name="PangoEngineLang.stability-level"></a><h2>Stability Level</h2>
Unstable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="PangoEngineLang.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
                    <a class="link" href="PangoEngineLang.html#PangoEngineLang-struct" title="PangoEngineLang">PangoEngineLang</a>;
                    <a class="link" href="PangoEngineLang.html#PangoEngineLangClass" title="PangoEngineLangClass">PangoEngineLangClass</a>;
#define             <a class="link" href="PangoEngineLang.html#PANGO-ENGINE-TYPE-LANG:CAPS" title="PANGO_ENGINE_TYPE_LANG">PANGO_ENGINE_TYPE_LANG</a>
#define             <a class="link" href="PangoEngineLang.html#PANGO-ENGINE-LANG-DEFINE-TYPE:CAPS" title="PANGO_ENGINE_LANG_DEFINE_TYPE()">PANGO_ENGINE_LANG_DEFINE_TYPE</a>       (name, prefix, class_init, instance_init)
</pre>
</div>
<div class="refsect1" lang="en">
<a name="PangoEngineLang.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  <a
href="/home/behdad/.local/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"
>GObject</a>
   +----<a class="link" href="pango-Engines.html#PangoEngine">PangoEngine</a>
         +----PangoEngineLang
</pre>
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<div class="refsect1" lang="en">
<a name="PangoEngineLang.description"></a><h2>Description</h2>
<p>
The <em class="firstterm">language engines</em> are rendering-system independent
engines that determine line, word, and character breaks for character strings.
These engines are used in <a class="link" href="pango-Text-Processing.html#pango-break" title="pango_break ()"><code class="function">pango_break()</code></a>.
</p>
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<div class="refsect1" lang="en">
<a name="PangoEngineLang.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="PangoEngineLang-struct"></a><h3>PangoEngineLang</h3>
<pre class="programlisting">typedef struct _PangoEngineLang PangoEngineLang;</pre>
<p>
The <a class="link" href="PangoEngineLang.html" title="PangoEngineLang"><span class="type">PangoEngineLang</span></a> class is implemented by engines that
customize the rendering-system independent part of the
Pango pipeline for a particular script or language. For
instance, a custom <a class="link" href="PangoEngineLang.html" title="PangoEngineLang"><span class="type">PangoEngineLang</span></a> could be provided for
Thai to implement the dictionary-based word boundary
lookups needed for that language.</p>
<p>
</p>
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<hr>
<div class="refsect2" lang="en">
<a name="PangoEngineLangClass"></a><h3>PangoEngineLangClass</h3>
<pre class="programlisting">typedef struct {
  void (*script_break) (PangoEngineLang *engine,
			const char    *text,
			int            len,
			PangoAnalysis *analysis,
			PangoLogAttr  *attrs,
			int            attrs_len);
} PangoEngineLangClass;
</pre>
<p>
Class structure for <a class="link" href="PangoEngineLang.html" title="PangoEngineLang"><span class="type">PangoEngineLang</span></a></p>
<p>

</p>
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<td><p><span class="term"><em class="structfield"><code>script_break</code></em> ()</span></p></td>
<td> Provides a custom implementation of <a class="link" href="pango-Text-Processing.html#pango-break" title="pango_break ()"><code class="function">pango_break()</code></a>.
If <a
href="/home/behdad/.local/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>, <a class="link" href="pango-Text-Processing.html#pango-default-break" title="pango_default_break ()"><code class="function">pango_default_break()</code></a> is used instead. If not <a
href="/home/behdad/.local/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>, for
Pango versions before 1.16 (module interface version before 1.6.0),
this was called instead of <a class="link" href="pango-Text-Processing.html#pango-default-break" title="pango_default_break ()"><code class="function">pango_default_break()</code></a>, but in newer versions,
<a class="link" href="pango-Text-Processing.html#pango-default-break" title="pango_default_break ()"><code class="function">pango_default_break()</code></a> is always called and this is called after that to
allow tailoring the breaking results.
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<hr>
<div class="refsect2" lang="en">
<a name="PANGO-ENGINE-TYPE-LANG:CAPS"></a><h3>PANGO_ENGINE_TYPE_LANG</h3>
<pre class="programlisting">#define PANGO_ENGINE_TYPE_LANG "PangoEngineLang"
</pre>
<p>
A string constant defining the engine type
for language engines.
These engines derive from <a class="link" href="PangoEngineLang.html" title="PangoEngineLang"><span class="type">PangoEngineLang</span></a>.
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="PANGO-ENGINE-LANG-DEFINE-TYPE:CAPS"></a><h3>PANGO_ENGINE_LANG_DEFINE_TYPE()</h3>
<pre class="programlisting">#define             PANGO_ENGINE_LANG_DEFINE_TYPE(name, prefix, class_init, instance_init)</pre>
<p>
Outputs the necessary code for GObject type registration for a
<a class="link" href="PangoEngineLang.html" title="PangoEngineLang"><span class="type">PangoEngineLang</span></a> class defined in a module. Two static symbols
are defined.
</p>
<p>
</p>
<pre class="programlisting">
 static GType <em class="replaceable"><code>prefix</code></em>_type;
 static void <em class="replaceable"><code>prefix</code></em>_register_type (GTypeModule module);
</pre>
<p>
</p>
<p>
The <code class="function"><em class="replaceable"><code>prefix</code></em>, <code class="function">_register_type()</code></code>
function should be called in your <a class="link" href="pango-Engines.html#script-engine-init" title="script_engine_init ()"><code class="function">script_engine_init()</code></a> function for
each type that your module implements, and then your <a class="link" href="pango-Engines.html#script-engine-create" title="script_engine_create ()"><code class="function">script_engine_create()</code></a>
function can create instances of the object as follows:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
 PangoEngine *engine = g_object_new (<em class="replaceable"><code>prefix</code></em>_type, NULL);
</pre></div>
<p>

</p>
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<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td> Name of the the type to register (for example:, <code class="literal">ArabicEngineFc</code>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefix</code></em> :</span></p></td>
<td> Prefix for symbols that will be defined (for example:, <code class="literal">arabic_engine_fc</code>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>class_init</code></em> :</span></p></td>
<td> Class initialization function for the new type, or <a
href="/home/behdad/.local/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>instance_init</code></em> :</span></p></td>
<td> Instance initialization function for the new type, or <a
href="/home/behdad/.local/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"
><code class="literal">NULL</code></a>
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